Lubricants stabilized against oxidative degradation by the incorporation therein of N-thioalkylenephenothiazine derivatives corresponding to the formula
wherein R₁ are independently hydrogen, alkyl of 1 to 24 carbon atoms, cycloalkyl of 5 to 7 carbon atoms or aralkyl of 7 to 9 carbon atoms;
A and Aʹ are independently alkylene of 1 to 8 carbon atoms;
n is 0 or 1; and
R₂ is alkyl of 1 to 18 carbon atoms, cycloalkyl of 5 to 7 carbon atoms, said cycloalkyl substituted by alkyl of 1 to 18 carbon atoms, phenyl, phenyl substituted by alkyl, alkoxy or thioalkyl to a total carbon atom content of 7 to 30, naphthyl or naphthyl substituted by alkyl, alkoxy or thioalkyl to a total carbon atom content of 11 to 40, as well as certain phenothiazines within the indicated group.
通过在润滑剂中掺入符合以下式子的 N-
硫代烷基
吩噻嗪衍
生物而防止氧化降解的润滑剂
其中 R₁ 独立地为氢、1 至 24 个碳原子的烷基、5 至 7 个碳原子的环烷基或 7 至 9 个碳原子的芳烷基;
A 和 Aʹ 独立地为 1 至 8 个碳原子的亚烷基;
n 为 0 或 1;以及
R₂是 1 至 18 个碳原子的烷基、5 至 7 个碳原子的环烷基、被 1 至 18 个碳原子的烷基取代的环烷基、苯基、被烷基、烷氧基或
硫代烷基取代的苯基(总碳原子含量为 7 至 30 个)、
萘基或被烷基、烷氧基或
硫代烷基取代的
萘基(总碳原子含量为 11 至 40 个),以及上述组中的某些
吩噻嗪。